Sifter mechanism for conveyers



Feb. 23, 1932. HfH. BARBER 1,846,668

SIFTER MECHANISM FOR CONVEYERS Filed March 2, 1928 4 Sheets-Shae l .Z Z TIE-Z7251; Hargfi B arb er.

Feb. 23, 1932. BARBEYR 1,846,668

SIFTER MECHANISM FOR CONVEYERS Filed March 2 1928 4 Sheets-Sheet 2 Harzzyfi B czrb er.

Feb. 23, 1932.

H. H BARBER 1,846,668

SIFTER MECHANISM-FOR CONVEYERS Filed March 2, 1928 4 Sheets-Sheet 3 jidrzyfffiarber.

Feb. 23, 1932. H. H. BARBER SIFTER MECHANISM FOR CONVEYERS 4 Sheets-Sheet 4 fiarJyfiBarber.

Filed March 2, 1928 Patented Feb. 23, 1932 UNITED, STATES PATENT OFFICE HARRY H- BARBER, 01E AURORA, ILLINOIS, ASSIGNOR TO BARBER- GREENE 00., A COR- PORATION OF ILLINOIS SIFTER MECHANISM FOR CONVEYERS Application filed March 2, 1928. Serial No. 58,561.

This invention relates to sifter mechanism for conveyors.

It is desirable in many instances to sift the material, such as coal for example, that is being handled by a conveyer. It is also highly desirable that the siftings be kept separate from the larger pieces. Due to'the fact that conveyers of this type usually travel forward into a pile of material or swing around, frequently changing their location, it is exceedingly diflicult to gather or collect the siftings that are screened through the screen ofthe sifter that comprises a part of the sifter mechanism.

It is among the objects of this invention to provide a novel form of sifter mechanism for a conveyer that is adapted to travel about during its operation, together with means for collecting and conveying the siftings to a receptacle which may be located at a remote point but is preferably movable with the conveyer in order that the siftings may easily be collected, irrespective of the traveling movements of the conveyer.

It is also an object of this invention to pro vide means for protecting thescreen of the sifter from large lumps of materialytogether with means for agitating the screen and collecting and conveying the siftings.

The invention comprises the novel structure and combination of parts hereinafter described and more particularly pointed out and defined in the appended claims.

In the accompanying drawings which illustrate a preferred embodiment of this invention and in which similar reference numerals refer to similar features in the diiferent views:

Figure 1 is a fragmentary elevational view of a conveyer involving this invention.

' Figure 2 is a vertical section through the siftings receptacle on the truck of the conveyer, showing the filling chute in section.

Figure 3 is an enlarged sectional view taken upon the line III-III of Figure 2.

Figure 4 is an enlarged fragmentary elevational view of the upper part of the conveyer, illustrating more clearly the manner of supporting and operating the sifter mechamsm.

Figure 5 is an enlarged sectional view taken upon the line VV of Figure 6.

Figure 6 is a vertical sectional view taken through the Sifter mechanism upon the line VI-VI of Figure 5.

Figure 7 is an enlarged sectional view taken upon the line VII-VII of Figure 6.

Figure 8 is an enlarged elevational view of the driving mechanism for, operating the sifter.

Figure 9 is an enlarged horizontal top plan view of the sifter.

Figure 10 is an enlarged fragmentary side elevational View of the lower part of the sifter.

In the drawings, only those parts of the conveyer have been illustrated that cooperate with or are adjacent the mechanism involving this invention. In Figure 1 there is shown the upper end of the conveyer boom 1 having a discharge chute 2 adjustably pivoted to the boom as indicated at 2a and controlled in its inclination by a link 2?) slidably connected to a slotted plate let on the boom and connected to an actuated link a slfter mechanism 3 is connected to the bottom of the dischargechute. The numeral 4 represents a part of the truck that supports the boom and that is adapted to travel to meet the requirements of operation. The siftings receptacle 5 is provided upon the truck 4 of the conveyer and a chute 6 leads from the sifter mechanism to the receptacle 5 whereby the siftings may be conveyed'to a receptacle that moves around with the conveyer and from which the siftings can be readily removed by a wheel barrow or the like when the receptacle becomes full. The chute 6 is pivotally attached to the bottom of the casing 7 and slidably engages the wall of the receptacle 5 during any swinging adjustment of the chute p The sifter mechanism is housed within a casing 7 which is attached to the bottom of the chute which is of course open at its bottom. To the bottom of the chute 2 are secured a plurality of supporting members 8 upon which a screen 9 is supported. Upon the inner ends of the discharge chute 2 are impact members 10 which slope upwardly with respect to the plane of the screen. These impact members are spaced apart and adapted for receiving the material as it is discharged from conveyer buckets. They are especially adapted for receiving lumps of coal, etc. before they reach the screen. If heavy particles, such as large lumps of coal, where directly discharged upon the screen, the impact thereof would soon break or injure the screen. A tie rod 11 preferably extends through the impact members for rigiditying purposes. It will be noted that the casing 7 forms a compartment below the screen. A pair of shafts 12 and 13 are journalled in this compartment. The shaft 12 projects beyond the compartment and is provided with an operating gear 14: as shown in Figure 8 whereby said shaft may be rotated. The shaft 12 embodies a stationary clutch element 15 and a movable clutch member 16 which is actuated by a link 17 connected to an arm 18 of a bell crank lever 19 which is pivoted at 20 upon the shafts. When the bell crank lever 19 is swung into dotted line position, the

' two clutch members will be engaged and when the bell crank lever is thrown into full line position, the clutch members will be disengaged. llt is therefore possible to disconnect the driving mechanism to the shaft 12 if desired.

An endless conveyer 21 is supported upon sprockets 22 mounted upon the shafts 12 and 18. The conveyer 21 consists of a pair of chains which travel over the sprockets 22 and which chains are connected by suitable flights 23. It will be noted that the flights on the lower reach of the chains travel in contact with the bottom of the casing 7 and that the sittings that drop through the screen are conveyed along the bottom of the compartment by the said flights 23 until they fall through an opening 2% adjacent the upper end of the casing 7. It will be noted that the sittings chute 6 is connected adjacent the opening 24 in order that the sittings that are conveyed by the endless conveyer 21 may be discharged into the chute 6 and travel downwardly into the sittings receptacle 5 upon the conveyer truck. It will be appreciated that the endless conveyer 21 is principally for the purpose of conveying the sittings upwardly to a sutliciently high point that they may readily be dropped into the receptacle 5 by gravity and to also reduce the movement of the chute 6 thru swinging adjustments or the discharge chute 2.

In order to agitate the screen, suitable rollers 26 carried by brackets 27 attached to suitable angle members 28 along the longitudinal margin of the screen are provided. Suitable eccentrics or cams 29 are attached to the shafts 12 and 13 for engaging the rollers 26 for vibrating the screen.

It will be noted that the conveyer com- 1 partment is narrower than the width of the screen and that the tops of the conveyer compartment are connected to the sides of the screen by diverging plates 30. The cams 29 are located outside of the casing 7 as clearly shown in Figure 7 A metal shield 31 is preferably placed over the outer ends of the impact members 10 as shown in Figures 6 and 9 and the screen 9 eX- tends to the inner edge of the shield 13 as shown in Figure 6 in order that no material can escape without passing over the screen.

I am aware that many changes may be made, and numerous details of construction may be varied through a wide range without departing from the principles of this invention, and I therefore do not purpose limiting the patent granted hereon, otherwise than necessitated by the prior art.

I claim as my invention:

1. The combination with a conveyer truck having a sittings receptacle, of a conveyer boom mounted upon said truck and inclining upwardly and rearwardly in its operative position, a discharge chute pivoted to the upper end of said boom and inclining clownwardly and rearwardly, an adjustable connection between said chute and boom, a sitter mechanism attached to said discharge chute, a sittings collecting platform below said sitter mechanism, an endless conveyer travel ling over said platform for conveying the siftings upwardly and a sittings chute connected to said platform and slidably engaging said receptacle during adjustments of said discharge chute.

2. The combination with a conveyer truck having a sittings receptacle, a boom mounted upon said truck and extending upwardly and rearwardly in its operative position, a discharge chute pivotally connected to the upper end of the boom and inclining downwardly and rearwardly thereof, means for adjusting the inclination of said chute, a sitter mechanism associated with said chute, a sittings collecting platform below said mechanism, an endless conveyer travelling over said plat form for conveying the sittin gs upwardly for discharging the same by gravity into said receptacle and a sittings discharge chute connected to said platform and slidably engaging said receptacle during adjustment of the first mentioned chute.

3. The combination with a. conveyer truck having a sittings receptacle, of a conveyer boom mounted upon said truck and inclining rearwardly and upwardly in its operative position, an adjustable discharge chute pivoted to the upper end of said boom and inclining downwardly and rearwardly beyond the said upper end of said boom, a sitter mechanism attached to said discharge chute, a sittings collecting platform below said mechanism, an endless conveyer travelling over said platform for conveying the sittings upwardly to a gravity discharging point, and

a downwardly inclined chute extending from said platform to said receptacle, and responsive to the adjustments of said discharge chute.

4;. The combination with a truck having a siftings receptacle, a boom mounted upon said truck and extending upwardly and rearward ly in its operative position, an adjustable discharge chute pivotally connected to the upper part of said boom and inclining downwardly and rearwardly beyond the rear end of said boom, a sifter mechanism associated with said chute, a sifter collecting platform beneath said 'sifter mechanism, an endless conveyer traveling over said platform for conveying the siftings upwardly in a direction toward said boom, to a gravity discharge point and a chute extending from the upper end of said platform to said receptacle.

5. The combination with a truck having a siftings receptacle, of a boom mounted upon said truck and projecting rearwardly and upwardly in its operative position, a discharge chute adjustably pivoted to the upper end of said boom and inclining downwardly and rearwardly, screening mechanism associated with said discharge chute, a platform for collecting the screening, means for conveying the screening upwardly to a gravity discharge point and a screening chute responsive to the adjustments of said discharge chute extending from said means to said receptacle.

In testimony whereof I have hereunto subscribed my name at Chicago, Cook County,

HARRY H. BARBER.

-., Illinois. 

